<template>
  <div>
      <!-- 面包屑导航区域 -->
  <el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>参数列表</el-breadcrumb-item>
  </el-breadcrumb>
  <!-- 卡片试图区域 -->
  <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意:只允许为第三级分类设置相关参数!" type="warning"
      :closable="false"
      show-icon>
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
          <el-col>
              <span>选择商品分类:</span>
              <!-- 选择商品分类的级联选择框  -->
              <el-cascader
              v-model="seletedCateKeys"
              :options="catelist"
              :props="cateProps"
              @change="handleChange">
              </el-cascader>
          </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
            <el-button type="primary" size="mini" :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button>
            <el-table :data="manyTableDate" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染tag标签 -->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                  <!-- 添加文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small"
                  @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
            <el-button type="primary" size="mini" :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button>
            <el-table :data="onlyTableDate" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染tag标签 -->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                  <!-- 添加文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small"
                  @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
        </el-tab-pane>
      </el-tabs>
  </el-card>
  <!-- 添加参数对话框 -->
  <el-dialog
  :title="'添加' + titleText"
  :visible.sync="addDialogVisible"
  width="50%"
  @close="addDialogClosed">
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
    <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
  <!--修改参数对话框  -->
    <el-dialog
  :title="'添加' + titleText"
  :visible.sync="editDialogVisible"
  width="50%"
  @close="editDialogClosed">
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
    <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      catelist: [],
      //   级联选择框配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定的数组
      seletedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableDate: [],
      // 静态参数的数据
      onlyTableDate: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加数据的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加数据的表单验证对象
      addFormRules: {
        attr_name: [{
          required: true, message: '请输入参数名称', trigger: 'blur'
        }]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [{
          required: true, message: '请输入参数名称', trigger: 'blur'
        }]
      },
      // 控制按钮与文本框的切换显示
      inputVisible: false,
      // 文本框中输入的内容
      inputValue: ''
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 级联选择框发生改变会触发
    handleChange () {
      this.getParamsData()
      console.log(this.manyTableDate)
    },
    handleTabClick () {
      this.getParamsData()
    },
    async getParamsData () {
      if (this.seletedCateKeys.length !== 3) {
        this.seletedCateKeys = []
        this.manyTableDate = []
        this.onlyTableDate = []
        return
      }
      // console.log(this.seletedCateKeys)
      //   根据所选分类的id,和当前所处的面板,获取对应参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败!')
      }
      // 将返回的attr_vals字符串转换为数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 添加控制文本框的显示与隐藏属性
        item.inputVisible = false
        // 控制文本框输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableDate = res.data
      } else {
        this.onlyTableDate = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮,添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败!')
        }
        this.$message.success('添加参数成功!')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog (attrId) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`,
        { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改表单
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮,修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功!')
      this.getParamsData()
    },
    // 文本框失去焦点或按下enter触发
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求,保存这次操作
      this.savaAttrvals(row)
    },
    async savaAttrvals (row) {
      // 需要发起请求,保存这次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数成功!')
    },
    showInput (row) {
      row.inputVisible = true
      // $nextTick 方法的作用,就是当页面上元素
      // 被重新渲染后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.savaAttrvals(row)
    }
  },
  computed: {
    //   如果按钮需要被禁用则返回true否则返回false
    isBtnDisabled () {
      if (this.seletedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId () {
      if (this.seletedCateKeys.length === 3) {
        return this.seletedCateKeys[2]
      }
      return null
    },
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin:15px 0;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 150px;
}
</style>
